Synopsys Timing Constraints And Optimization User Guide 2021

Unlocking Timing Closure: A Deep Dive into the Synopsys Timing Constraints and Optimization User Guide (2021)

2. Run Synopsys Design Compiler to synthesize the design and optimize it for timing performance.

3. Run Synopsys PrimeTime to analyze the timing performance of the design.

The 2021 guide emphasizes PrimeTime as the industry "golden" signoff tool.

Basic Concepts for Optimizing Designs. Compiling a Design. Optimization Techniques. Optimizing for Delay . * Automatic Ungrouping. picture.iczhiku.com Timing Constraints Manager | Synopsys synopsys timing constraints and optimization user guide 2021

Multicore Optimization

: Techniques like adaptive retiming, register merging, and FSM optimization. High-Level Optimization : Datapath and multiplexer mapping strategies. 7. Analysis and Management Reporting Constraints report_timing check_timing report_constraint to verify the design. Managing Large Designs Unlocking Timing Closure: A Deep Dive into the

1. Netlist Correlation: Ensure read_verilog in PrimeTime matches DC output. Use report_design -physical_context.
2. Constraint Debugging: Run check_timing in both tools. The guide introduces report_sdc_errors in 2021 to list all SDC commands that were ignored or reinterpreted.
3. Delay Calculation Correlation: Use set_delay_calculation -arm_core aware to match PrimeTime's Advanced Waveform Propagation (AWP).
4. Noise and Crosstalk: The guide introduces set_si_optimization -merge_cap true in DC to model the same crosstalk delays that PrimeTime will later sign off.

• Placement-based Optimization: Moving cells to reduce wire delay.
• HFN (High Fanout Net) Synthesis: Buffer tree construction for clock and reset networks.
• Useful Skew: Intentionally adding delay to the clock path of a capturing register to borrow time from the next pipeline stage, thereby fixing setup violations.